I'll admit I wasn't a fan of process-per-tab originally either. However, since ever browser leaks memory, the ability to close some windows and reclaim the memory that was lost has been very useful to me (I tend to have 50+ tabs open at most times, and for many days at a time).
That being said, I'd also be ok with process-per-window, as that would give me the same basic ability.
That being said, I'd also be ok with process-per-window, as that would give me the same basic ability.